M306V2EEFS datasheet(193/271 Pages) RENESAS

193 / 271 page

Rev.1.40

Oct 06, 2004 page 193 of 269

M306V2ME-XXXFP, M306V2EEFP

2.16.6 Memory for OSD

There are 2 types of memory for OSD : OSD ROM (addresses 9000016 to AFFFF16) used to store

character dot data and OSD RAM (addresses 040016 to 13FF16) used to specify the kinds of display

characters, display colors, and SPRITE display. The following describes each type of memory.

(1) ROM for OSD (addresses 9000016 to AFFFF16)

The dot pattern data for OSD characters is stored in the character font area in the OSD ROM and the

CD font data for OSD characters is stored in the color dot font area in the OSD ROM. To specify the

kinds of the character font and the CD font, it is necessary to write the character code into the OSD

RAM.

For character font, there are the following 2 mode.

• OSDL enable mode

16 ✕ 20-dot font and 24 ✕ 32-dot font

• OSDL disable mode

16 ✕ 20-dot font

The modes are selected by bit 3 of the OSD control register 3 for each screen.

The character font data storing address for OSDL enable/OSDL disable mode are shown in Figures

2.16.20 and 2.16.21. The conditions for each OSDL enable/disable mode are shown in Figure

2.16.22. The CD font data storing address is shown in Figure 2.16.23.

Figure 2.16.19 OSD control register 4

OSD control register 4

Symbol

Address

When reset

OC4

025F16

XXXXX002

Bit name

Bit symbol

Function

OC40

OC41

OSDL mode

selection bit

Number of horizontal

display characters

selection bit

0 : OSDL enable mode

1 : OSDL disable mode

0 : 32 characters for each block

(32-character mode)

1 : 42 characters for each block

(42-character mode)

Nothing is assigned.

In an attempt to write to these bits, write “0.” The value, if read, turns out to be “0.”

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